Abstract
The existence of the TmAgSn compound in the Tm–Ag–Sn system in the form of two polymorphs was confirmed. The high-temperature phase crystallizes with the LiGaGe type (P63mc, Z = 2), and the lowtemperature one with the ZrNiAl type (\(P\overline 6 2m\), Z = 3). A new ternary compound TmAgSn2 was found to exist (Cu3Au type, \(Pm\overline 3 m\), Z = 1). The polymorphic transition temperature of the TmAgSn was found to be 1214 K using differential thermal analysis. A comparative investigation of the compounds by 119Sn Mossbauer spectroscopy showed a difference in the chemical bonding character of tin atoms: in TmAgSn2, tin has a typical valence state for metallic systems, whereas in both TmAgSn polymorphs additional interaction between the 5s orbitals of silver atoms and the 5p orbitals of tin atoms takes place.
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